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EC number: 500-151-7 | CAS number: 61791-12-6 1 - 6.5 moles ethoxylated
Endpoint summary
Administrative data
Description of key information
Hydrolysis
HYDROWIN v2.00 program of Estimation Programs Interface (2018) prediction model was used to predict the hydrolysis half-life of test chemical. The estimated half-life of test chemical was determined to be 1.707 yrs and 62.345 days at pH 7.0 and 8.0 (at 25ᵒC) respectively, indicating that it is not hydrolysable.
Biodegradation in water
Estimation Programs Interface Suite (2018) was run to predict the biodegradation potential of the test chemical in the presence of mixed populations of environmental microorganisms. The biodegradability of the substance was calculated using seven different models such as Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI Linear Model, MITI Non-Linear Model and Anaerobic Model (called as Biowin 1-7, respectively) of the BIOWIN v4.10 software. The results indicate that test chemical is expected to be not readily biodegradable.
Biodegradation in water and sediment
Estimation Programs Interface (2018) prediction model was run to predict the half-life in water and sediment for the test chemical. If released in to the environment, 17.7% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of test chemical in water is estimated to be 37.5 days (900 hrs). The half-life (37.5 days estimated by EPI suite) indicates that the chemical is not persistent in water and the exposure risk to aquatic animals is moderate to low whereas the half-life period of test chemical in sediment is estimated to be 337.5 days (8100 hrs). However, as the percentage release of test chemical into the sediment is less than 1% (i.e, reported as 0.00393%), indicates that test chemical is not persistent in sediment.
Biodegradation in soil
The half-life period of test chemical in soil was estimated using Level III Fugacity Model by EPI Suite version 4.1 estimation database (2018). If released into the environment, 82.3% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of test chemical in soil is estimated to be 75 days (1800 hrs). Based on this half-life value of test chemical, it is concluded that the chemical is not persistent in the soil environment and the exposure risk to soil dwelling animals is moderate to low.
Bioaccumulation: aquatic / sediment
BCFBAF model of Estimation Programs Interface was used to predict the bioconcentration factor (BCF) of test chemical. The bioconcentration factor (BCF) of test chemical was estimated to be 3.162 L/kg whole body w.w (at 25 deg C) which does not exceed the bio concentration threshold of 2000, indicating that the test chemical is not expected to bioaccumulate in the food chain.
Adsorption / desorption
KOCWIN model of Estimation Programs Interface was used to predict the soil adsorption coefficient i.e Koc value of test chemical. The soil adsorption coefficient i.e Koc value of test chemical was estimated to be 10000000000 L/kg (log Koc=11.2197) by means of MCI method (at 25 deg C). This Koc value indicates that the test chemical has a very strong sorption to soil and sediment and therefore have negligible migration potential to ground water.
Additional information
Hydrolysis
Predicted data and various experimental studies of the test chemical were reviewed for the hydrolysis end point which are summarized as below:
In a prediction done using the HYDROWIN v2.00 program of Estimation Programs Interface (2018) prediction model was used to predict the hydrolysis half-life of test chemical. The estimated half-life of test chemical was determined to be 1.707 yrs and 62.345 days at pH 7.0 and 8.0 (at 25ᵒC) respectively, indicating that it is not hydrolysable.
In a supporting weight of evidence study from authoritative databases (2017) for the test chemical,the hydrolysis half-life and base catalyzed second order hydrolysis rate constant was determined using a structure estimation method of the test chemical. The second order hydrolysis rate constant of test chemical was determined to be 0.15 L/mol-sec with corresponding half-lives of 1.5 yrs and 55 days at pH 7 and 8, respectively.
For the test chemical, the hydrolysis half-life and base catalyzed second order hydrolysis rate constant was determined using a structure estimation method of the test chemical (HSDB, 2017). The second order hydrolysis rate constant of test chemical was determined to be 0.27 L/mol-sec with corresponding half-lives of 294 days and 29 days at pH 7 and 8, respectively.
On the basis of the above results for test chemical, it can be concluded that the hydrolysis half-life value of test chemical was evaluated to be 29 days to 1.707 yrs, indicating that the test chemical is not hydrolysable.
Biodegradation in water
Predicted data and various experimental studies of the test chemical were reviewed for the biodegradation end point which are summarized as below:
In a prediction using the Estimation Programs Interface Suite (2018), the biodegradation potential of the test chemical in the presence of mixed populations of environmental microorganisms was estimated. The biodegradability of the substance was calculated using seven different models such as Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI Linear Model, MITI Non-Linear Model and Anaerobic Model (called as Biowin 1-7, respectively) of the BIOWIN v4.10 software. The results indicate that test chemical is expected to be not readily biodegradable.
In a supporting weight of evidence study from study report (2018) for the test item,42-days Closed Bottle test following the OECD guideline 301 D to determine the ready biodegradability of the test chemical. The study was performed at a temperature of 20°C. The test system included control, test item and reference item. Polyseed were used for this study. 1 polyseed capsule were added in 500 ml D.I water and then stirred for 1 hour for proper mixing and functioning of inoculum. This gave the bacterial count as 10E7 to 10E8 CFU/ml. At the regular interval microbial plating was also performed on agar to confirm the vitality and CFU count of microorganism. The concentration of test and reference item (Sodium Benzoate) chosen for both the study was 4 mg/L, while that of inoculum was 32 ml/l. OECD mineral medium was used for the study. ThOD (Theoretical oxygen demand) of test and reference item was determined by calculation. % degradation was calculated using the values of BOD and ThOD for test item and reference item. The % degradation of procedure control (reference item) was also calculated using BOD & ThOD and was determined to be 70.48%. Degradation of Sodium Benzoate exceeds 45.18 % on 7 days & 70.48 % on 14th day. The activity of the inoculum was thus verified and the test can be considered as valid.The BOD42 value of test chemical was observed to be 0.6 mgO2/mg. ThOD was calculated as 2.6 mgO2/mg. Accordingly, the % degradation of the test item after 42 days of incubation at 20 ± 1°C according to Closed Bottle test was determined to be 23.07%. Based on the results, the test item, under the test conditions, was considered to be not readily biodegradable in nature.
For the test chemical,35-days Closed Bottle test following the OECD guideline 301 D to determine the ready biodegradability of the test chemical (Experimental study report, 2018). The study was performed at a temperature of 20°C. The test system included control, test item and reference item. Polyseed were used for this study. 1 polyseed capsule were added in 500 ml D.I water and then stirred for 1 hour for proper mixing and functioning of inoculum. This gave the bacterial count as 107 to 108 CFU/ml. At the regular interval microbial plating was also performed on agar to confirm the vitality and CFU count of microorganism. The concentration of test and reference item (Sodium Benzoate) chosen for both the study was 4 mg/L, while that of inoculum was 32 ml/l. OECD mineral medium was used for the study. ThOD (Theoretical oxygen demand) of test and reference item was determined by calculation. % degradation was calculated using the values of BOD and ThOD for test item and reference item. The % degradation of procedure control (reference item) was also calculated using BOD & ThOD and was determined to be 73.49%.Degradation of Sodium Benzoate exceeds 39.15% on 7 days & 70.48% on 14th day. The activity of the inoculum was thus verified and the test can be considered as valid. The BOD35 value of test chemical was observed to be 1.2 mgO2/mg. ThOD was calculated as 2.71 mgO2/mg. Accordingly, the % degradation of the test item after 35 days of incubation at 20 ± 1°C according to Closed Bottle test was determined to be 44.28%. Based on the results, the test item, under the test conditions, was considered to be not readily biodegradable in nature.
On the basis of above results for test chemical, it can be concluded that the test chemical can be expected to be not readily biodegradable in nature.
Biodegradation in water and sediment
Estimation Programs Interface (2018) prediction model was run to predict the half-life in water and sediment for the test chemical. If released in to the environment, 17.7% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of test chemical in water is estimated to be 37.5 days (900 hrs). The half-life (37.5 days estimated by EPI suite) indicates that the chemical is not persistent in water and the exposure risk to aquatic animals is moderate to low whereas the half-life period of test chemical in sediment is estimated to be 337.5 days (8100 hrs). However, as the percentage release of test chemical into the sediment is less than 1% (i.e, reported as 0.00393%), indicates that test chemical is not persistent in sediment.
Biodegradation in soil
The half-life period of test chemical in soil was estimated using Level III Fugacity Model by EPI Suite version 4.1 estimation database (2018). If released into the environment, 82.3% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of test chemical in soil is estimated to be 75 days (1800 hrs). Based on this half-life value of test chemical, it is concluded that the chemical is not persistent in the soil environment and the exposure risk to soil dwelling animals is moderate to low.
On the basis of available information, the test chemicalcan be considered to benot readily biodegradable in nature.
Bioaccumulation: aquatic / sediment
Predicted data and various experimental studies of the test chemical were reviewed for the bioaccumulation end point which are summarized as below:
In a prediction done using the BCFBAF Program of Estimation Programs Interface was used to predict the bioconcentration factor (BCF) of test chemical. The bioconcentration factor (BCF) of test chemical was estimated to be 3.162 L/kg whole body w.w (at 25 deg C).
In a supporting weight of evidence study from authoritative databases (2017) for the test chemical,bioaccumulation experiment was conducted for estimating the BCF (bioaccumulation factor) value of test chemical. The bioaccumulation factor (BCF) value was calculated using a logKow of 3.24 and a regression-derived equation. The estimated BCF (bioaccumulation factor) value of test chemical was determined to be 62 dimensionless.
For the test chemical, the bioaccumulation study in fish was conducted for determining the BCF (bioaccumulation factor) value of test chemical (HSDB and PubChem, 2017). The BCF (bioaccumulation factor) of test chemica in fish was determined to be < 10 dimensionless.
On the basis of above results for test chemical, it can be concluded that the BCF value of test chemical evaluated to be upto 62,which does not exceed the bioconcentration threshold of 2000, indicating that the test chemical is not expected to bioaccumulate in the food chain.
Adsorption / desorption
Predicted data and various experimental studies of the test chemical were reviewed for the adsorption end point which are summarized as below:
In a prediction done using theKOCWIN Programof Estimation Programs Interface was used to predict the soil adsorption coefficient i.e Koc value of test chemical. The soil adsorption coefficient i.e Koc value of test chemical was estimated to be 10000000000 L/kg (log Koc=11.2197) by means of MCI method (at 25 deg C).
The Soil Adsorption Coefficient i.e Koc value of test chemical was estimated using Adsorption Coefficient module program as Koc 10000000.0 (logKoc = 7) at pH range 1-14, respectively (ACD (Advanced Chemistry Development)/I-Lab predictive module, 2017)).
For the test chemical,adsorption study was conducted for estimating the adsorption coefficient (Koc) value of test chemical (HSDB and PubChem, 2017). The adsorption coefficient (Koc) value was calculated using a structure estimation method based on molecular connectivity indices. The adsorption coefficient (Koc) value of test chemical was estimated to be 10000000000 (Log Koc = 10).
On the basis of above overall results for test chemical, it can be concluded that the log Koc value of test chemical was estimated to be ranges from 7 to 11.2, respectively, indicating that the test chemical has a very strong sorption to soil and sediment and therefore have negligible migration potential to ground water.
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